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Genetic and environmental control of first lactation milk yield in cows and buffaloes



Genetic and environmental control of first lactation milk yield in cows and buffaloes



Livestock Production Science 17(3): 225-234



Sire evaluations, heritabilities, genetic and time trends and seasonal variation for first lactation records of 1680 buffaloes and high grades of Friesian cows were estimated by means of best linear unbiased prediction (BLUP) and approximate maximum likelihood procedures. Cows produced higher milk yields than buffaloes. Herd differences were higher for actual lactation yield produced between calving and termination of lactation compared to the standard lactation yield in 305 and 335 days for cows and buffaloes. Seasonal variation had no particular trend. The estimated transmitting abilities of sires were calculated from sire and genetic group solutions within the herd. Few buffalo sires had high estimated transmitting abilities for milk production, compared to cow sires. Correlations between sire values for the two measures of first lactation yield were positive. Genetic and time trends indicated low actual gain in milk production, which necessitates the application of effective breeding plans for improving milk production of cows and buffaloes. Heritability estimates were between 0.20-0.67 and 0.21-0.42 for the two measures of first-lactation yield, indicating that selection for increasing milk yield from cows and buffaloes under Egyptian conditions is quite possible. Sire selection on the basis of actual lactation yield may prove highly efficient in buffaloes.

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Accession: 005511919

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